Trimming machine



April 2, 1935. s. A. DoBYNE TRIMMINC. MACHINE .Tv e e h S *y .Tv nv e h s 2.

mb G mh 1 O w .mm .mi n, m. e Q s -wm m m wn E mw mb @m No .r -....Hw mmm .QN mw wh April 2, 1935. s. A. DoBYNE TRIMMING MACHINE 1931 2 Sheets-Sheet 2 Filed Sept. 2l

Patented Apr. 2, 1935 TTs STATES TRIMMING MACHINE Stevenson A. Dobyne, St. Louis, Mo., assigner to Champion Shoe Machinery Company, St. Louis, Mo., a corporation of Missouri Application September 21, 1931, Serial No. 563,912

4 Claims.

This invention relates generally to trimming machines such as are employed for the trimming of sole edges and especially to such machines as are particularly useful in shoe repair shops, in which it is desired that a plurality of different toc-ls be operated by the same driving mechanism, so that a combination machine is provided.

In the usual trimming machine particularly for operating upon sole edges and the edges of the usual top lift which is applied to Wooden heels, it is generally necessary that the shoe repairer be supplied with a number of different cutting tools which may be mounted upon his machine at Will in accordance with the type of Work to be operated upon. Accordingly it is extremely important that the mounting and dismounting of such tools be accomplished with facility. Heretofore, however, it has been customary, particuiarly in positions where the Vrotation of the cutting tool is in such direction that if a right-hand screw were employed the cutter would tend to work loose upon operation, it has been necessary to employ a left-hand screw assembly for securing the cutter tools in position upon their driving shafts. Such an arrangement for securing the cutter tools in position has been found to be disadvantageous forrthe reason that the same is oftentimes confusing to the shoe repairer and is not so easily manipulated as is desired.

' The object of this invention, generally stated, is to provide a trimming machine, particularly for use in shoe repair shops in which the cutting tools may be readily mounted and dismounted.

Another object of this invention is to provide a trimming machine of the kind referred to in which the various cutter elements are provided with shields in floating relation thereto.

Another object of this invention is 'to provide a machine of the kind referred to with a device for uniformly and accurately grinding the cutter elements. o

A more specific object of this invention is to provide a machine of the kind referred to by which the operations to be accomplished and the changes to be made in the apparatus may be accomplished with great facility and a maximum of convenience to the operator.

Other objects will become apparent to those skilled in the art when the following description is read in connection with the accompanying drawings, in which:

Figure l is a view in front elevation, shown partly in section to reveal the inter-connected parts of the machine and illustrating a trimming machine provided with the cutter mounting assembly and the cutter protecting shields of the present invention. l

Figure 2 is a sectional view in front elevation illustrating a modified form of Y iioating shield assembly.

Figure 3 is a view in endelevation of the cut'- ter grinding apparatus of the present invention.

Figure 4V is a plan view of rthe cutter grinding apparatus shown in Figures 1 and 3 with the cutter removed therefrom.

Generally stated, in accordance with the present invention, the usual trimming machine which is employed in shoe repair shops is provided with demountable cutter elements whichare secured in position by suitable means preferably extending on the interior of the driving shaft therefor, and having a manipulable part at the opposite end of the shaft from the cutter elements. Such an assembly for securing the various cutting tools in'position on the operating shaft is particularly advantageouswhen the direction of the movement of the cutter elements is such as would tend to loosen the usual right-hand screw which might be employed. In accordance with one ernbodiment' of the present invention the driving force is transmitted from the shaft to the cutter by means of one element which of course operates to prevent relative angular movement therebetween, while an independent means is v provided for maintaining the torque receiving element in engagement. The tendency of the parts toloosen is, therefore, avoided in View of the fact that av positive means is provided for preventing relative angular movement between the respective parts. Furthermore in accordance With the present'invention 'suitable shields are provided which are, preferably in floating relation VtoY the cutter yelements in order that under ordinary circumstances the shieldsv Will re- Volve with the cutter but the friction of a shoe part'against the shield Will be sufficient to prevent rotation thereof Without interfering with the movement of the fcutter. Among the features of the present invention, is the provision of a guide device for accurately grinding the cutter elements which are employed in such a machine as that referred to. In accordance with one embodiment of the present invention, a suitable grinding device such as for instance an emery Wheel may be mounted so as to be driven by one of the driving shafts of the machine while mounted adjacent thereto a suitable cutter support is provided and adapted to be moved in such a manner as to accurately direct the teeth of the cutter into grinding relation with the grinder.

Referring now particularly to the drawings, a machine of the type hereinbefore referred to is provided with a suitable supporting structure such as for instance a pedestal I*- Mounted upon the top of the pedestal I is a frame 2, provided with a plurality of sets of journal bosses 3 and 4 Within which may be mounted suitable bearing members for supporting shafts forrotation .A s is clearly illustrated in Figure 1,1 the respective bea-rings of the sets 3 and 4 are spaced sufficiently to accommodate a driving belt 5 thereibetween. In the embodiment illustrated,.ardriv ing pulley 6 is mounted upon a shaftl extending through the set of bearing .'bosses. 4 andV is disposed for engagement with'the belt .5; i

Detachably mounted upon one end of the-shaft 'I is a sole trimming tool 8 Y constructed in the usual manner which may be in the form of la" In accordance with the' present toothed cutter. invention,rthe toothed ,cutter orvtrimmingtool 8 is secured in position upon' the endof 'the shaft 'I by means of a. suitable clamping, device and the driving torque is transmitted'from the shaft 'I to the clamping device'through a suitable'a'rrangement such as a driving pin, which pinl is maintained in position by` independentmeans. As clearly illustrated in Figure,1,v'th'el -shaft I is, in accordance with the illustratedembodiment of this invention, made hollowand extending therethrough is a rod 9 havin'ga 'threadedfportionf I adapted to engage a corresponding threaded portion II of a clampingmember I2.v As Vis clearly illustrated in Figure 1the outer. end of the shaft I is reduced so thata circumferentially extending shoulder, I3 is provided.' Similarly thef outer end of the clamping member I2 is provided with a flange I 4 extending outwardly therefrom for a sufcientdistance vtoengage thehside of the cutter element S. Withthe arrangement just described, it is apparent that when the cutter element 8 is assembled, as illustrated in Figure l, the cutterwill be clamped in'toA position upon the shaft 'I upon tightening of thevfrod EL 'In order to accomplish such tiglitcninf)v a ysuitable manipulable portion such as for instance Va. knurled knob I5 may be provided' `ori theenduof the rod S, which extends outwardly beyond the shaft I and illustrated at the op'positefend'of the shaft from the cutter element 8. ,y .t y

In the reduced end portion of the shaft '5,' one or more axially'extendingnotches such as I6 are preferably provided for cooperatingfwithapin I'I extending radially from the ,clamping member I 2. With the arrangement'just describecLitis apparent that relative angular movement between the clamping member I2 and the shaft 'iisprevented and furthermore, the driving torque which is transmitted from theshaft I to the cutter 3 will be received bythe pin Il?, in view of the fact that relative angular movement between the cutter element 8 and the shaft.; 'I is prevented only by virtue of the frictional engagement or the clamping action of clamping memberIZ against the shoulder i3. It is apparent, therefore, that with the arrangement just described;` there will be no tendency for the clamping ,action of the member I2 to be released during rotationv ofthe shaft since there will be no tendency for a lrela,- tive movement between the clamping member I2 andthe shaft It will be apparent, therefore, that with such an assembly relativeangular movement between the clamping mern'berIZjand the shaft 'I is prevented by means of the' pin I'i engaging the notch I5,and accordingly relative angular movement of the cutter element 8 and the shaft 'I will be virtually prevented. The rod 9, however, operates to prevent disengagement of the pin Il from its notch I6, as well as to maintain a clamping action on the cutter element 8 between the flange Ill and the shoulder I3. When, however, it is desired to detach the cutter element 8 so that another and different cutter maybe substituted therefor itis apparent that upon loosening the knob I 5, the clamping member I2 will be released and the entire assembly, in-

v'cluding the cutter element 8 and the clamping member I2, may be removed from the end of the shaft 1. .J

A spindle I8 may be suitably mounted in the clamping element I2 as by means of a set screw,

and upon the spindle I8 a suitable shield such as .I9 may be provided in swiveled relation. As is 'clearly apparent from an inspection of Figure l, the shield I 9 may extend outwardly adjacent the cuttingl edges of the tool 8 and in accordance with one embodiment of the present invention, the shield I9 is so mounted upon the spindle I8 that a slight space, such as for instance 05" may exist between the shield and the edge of the cutting element 8. In accordance with another embodiment of the present invention, illustrated in Figure 2, the shield i9 is so mounted upon the spindle I8 that no space will exist between the edge of the shield and the cutting element 8. This may be accomplished by the provision of a spring Ysuch as 2l, which may be 'interposed between the head 22 of the spindle 'I 8 and a suitable shoulder23, formed on the interior of the shield I 9. With either of the shield arrangements just described, it is apparent-that the shield i9 will be rotatable relative to the spindle i8, and although under ordinary circumstances and especially if such a spring-as 2l be provided 'the tendency will be for the shield to rotate with the cutter element 8. It is apparent that if a shoe-part be brought into engagement with the shield i9 the friction thereof willbe sucient to cause the same tostop without interfering with the movement of the cutter element 8. Accordingly, with the provision of such a shield there will be no danger of marring a vshoe being operated upon by inadvertentlybringing a portion thereof into contact with a rotating part.

Mounted in bearing bosses 3 is a shaft 24 which carries atv one end thereof a trimming tool 25, 'whichfmay be in the nature of a toothed cutter adapted Vparticularly for heel trimming, and it will be apparent from an inspection of Figure 1 that the detachable mounting arrangement for the tool 25 is identical with the mounting arrangement which has been described forrthe tool 8, and accordingly like reference characters have been applied to the parts corresponding to those parts which have been specifically describedwith reference to the sole trimming cutter 8. It may be pointed out that the shaft 24 may be driven by any suitable'm'eans, which in the illustrated embodiment, is accomplished through a pulleyv 26 mounted upon the end thereof opposite the .cutter 25, adapted to be engaged by a suitable belt such as r2'I Awhich may be driven from a pulley 28 mounted upon the shaft l.

A second protecting shield 29 is preferably provided for cooperating with the trimmer 8. In the embodiment illustrated, the shield 29 is provided with portions 3l which may extend as fingers into the notches which exist between the respective teeth of the cutter 8, and in accordance with the present invention, a suitable ad.- justable mounting for the shield 2S is provided which will permit slight relative movement thereof in an axial direction with respect to the shaft 1 and the cutter 8. The shield 29 may be formed in the nature of a sleeve having inwardly extending anges 32 cooperating with the shaft 1 and adapted to guide the shield in its movement along the shaft 1 upon adjustment thereof. Mounted in the recessed portion between the flange 32 and the end of the sleeve suitable adjusting mechanism may be provided which, in the embodiment illustrated, comprises a collar 33, having a threaded portion 34, adapted to receive a thumb screw 35, having a knurled head 36. Interposed between the collar 33 and the flange 32, a'suitable coil spring as 31 may be provided and the assembly, including the spring 31 and the collar 33, may be secured within the recess by means of a suitable plug as 38 which may be threaded into the sleeve portion of the shield 29. With the arrangement just described, it is ap'- parent that upon tightening the thumb screw 35, the end thereof will engage the shaft 1 and the collar 33 will be forced into similar contact with the interior of the shield 29 so that the shield will be positioned with reference to the shaft 1.k When,however, it is desired to adjust the shield 29 either to the right or to the left the opposite procedure may be followedthat is, the thumb screw 35 may be released and the shield positioned, whereupon the screw 35 may be again tightened. During operation of the cutter 8, however, the operator often desires to make use of a greater portion of the cutter than is exposed betweenl the fingers 3| of the shield 29 and the edge of the shield |9, and it is apparent that when the greater area of the cutter 8 is desired, the edge of the sole being operated'upon may be forced against the fingers 3| and the shield 29 will be readily moved against the action of the spring 31. When, however, the parts are in their normal position, it is apparent that the spring 31 will operate to maintain the ngers 3| in such position that the inner extending points of the cutter 8 are protected and prevented from damaging articles which may be brought into contact therewith. In view of the fact that the shield 29 is adapted to rotate with the shaft 1, means is provided for protecting the extending knurled head 36 of the thumb screw 35 from accidentally engaging with articles which may be in the vicinity thereof. In order to thus protect the head 36 of the screw 35, a ring such as 39 may be suitablyvconnected to the exterior of the shield 29, and provided with a recessed portion 49 for accommodating the head 36 of the screw 35. Such a ring as 39 may have a continuous periphery in order that the obstruction which would otherwise be presented by the head 36 may be guarded while it is apparent from Figure l that suicient of the head 35 is exposed beyond the edges of the ring 39 to permit manipulation thereof.

A slightly modified form of shield is, however, desirable for use in connection with the heel trimming cutter such as 25. In the embodiment illustrated in Figure l, a shield 4| is provided for use in connection with the cutter 25, the shield 4| is provided with a protecting nange 42, extending adjacent the cutting edges of the tool 25. In order to support the shield 4|', a sleeve such as 43 may be mounted upon the framework and secured to one of the bearing bosses 3' by any suitable means such as for instance a screw 44. Froman inspection of Figure l, it willbe apparent that the end of the sleeve 43 extends outwardly toward the cutter 25, terminating just short thereof. Mounted upon the sleeve 43 is a second sleeve 45 -having a'ring 4|isecured thereto at the end nearest the frame 2 of the machine as by set screw 41.V A thumb screw 48 may be providedl in' threaded engagement with the'ring 46 and is adapted to extend into engagement with the sleeve 43 as through an opening 49 in the sleeve 45. With such an arrangement, it is apparent that the sleeve 45fmay be adjusted axially with respect to the sleeve 43 Yand clamped inlthe adjusted position by means of the thumb screw 48. At the outer endfof the sleeve 45, a-flange 59 is provided, which along with the ring 45 forms a guide for the shield 4|, it being observed that-the shield 4|: is provided with 'an inwardly extending flange 5|1 adapted tofcooperate with the flange 59. With the 'arrangement just described,` it is apparent that the shield 4| will be rotatable relative to' the sleeve 45, which latter may be adjusted axially with'respect to the sleeve 43 andthe shaft 24. The-'harige 42 on the shield 4|.ispreferab1yso extended that upon axial adjustment ofthe shield 4|, the exposed surface'of the'cutter 25 may be varied. Forinstance when an operator desires to trim a top lift having a thickness of say 1/8",the thumbv screw 48 may be released and the parts moved until a distance of 1/8" exists between the outer end of the'flange 42 and the'edge ofthe shield I9 adjacent cutter 25. With the parts thus adjusted, it is apparent that the exposed surface ofthe cutter is just Sunicient to -trim the top lift and accordingly any possibility of marring the heel covering is overcome. It is apparent that, although the shield 4| is normally stationary, it may, nevertheless, be rotated as by friction of the heel resting thereagainst during operation;

Upon the opposite end ofthe shaft '1 from the cutter 8 a suitable-grinding device such as for instance an emery wheel 52 may be provided. The emery wheel 52k preferably has its grinding faces shaped generally as illustrated in the dotted llines in Figure 4, in order that the grinding edges thereof may enter thenotches-such as 53 between the lrespective teeth 54 of a cutter of the type usually employed for trimming sole edges as the cutter-8 or for trimming heels as the cutter 25. In sharpeningsuch cutters as those employed, 8 and 25, it is necessary to grind the leading edges thereof and in -order to accomplish such grinding, the grinding'tool necessarily must enter the slot 53. In sharpening such cutters, it is of extreme importance thateach of the respective teeth be ground to the same Vextent and at 'the saine angle, and this invention contemplates a movable support adapted tovreceive a cutting tool such as 8 or 25 and accurately align the teeth thereof'with respect to the grinder 52 during the sharpening operation. YThe support for thus receivinga cutting tool may be mounted upon the frame 2 in any desired manner such as for instance through a boss 55 which may be attached to or integral with the frame 2 in the region of the grinder 52. The boss 55 may be provided with a suitable recess for receving a shank 5G, which may be adjustable relative to the frame by manipulation of a suitable set screw such as 5l. Axial adjustment of the'shank 56 relative to the boss 55 will adapt the-support'to accommodate cutters in --which the teeth extend at various angles as will bemoreclearly apparent from the following description: 'Extending from the shank 56 is an arm 5,8 carrying a shaft 59 upon which the'cutter support proper may be swiveled as through a bearing'l engaging the shaft. vAny Suitable means such as forl instance a collar 62 may be provided for'maintaining the bearing BI upon the shaft 59. A1 barrel 63 which may be integral with the bearing fis provided. with a cylindrical recess V54 adapted to receive a' post 65, so'that the the DO St'may vbe revolved Within the recess 6,4. The barrel63 may be provided with a suitable thumb screw such as 66 extending into a position foi-engagement with the post 55 in order to prevent removal 'thereof from the barrel 63. Mounted upon the barrel 63 in angularly adjustable relation thereto is a split sleeve 51 provided with an.adjusting devicevsuch as for instance a wing nuti inorder to clamp the same about the upwardly extending -portion 69 of the barrel 53, thesplit-sleeve having an outwardly extending arm 10. 1 A suitable arrangement for accommodating a cutting element such as 8 may be provided on the upper end of the post which may include a suitable knob as 1| for securing the cutting element in position. A notched wheel such as112 is also secured tothe post S5, and in accordance, with this invention, the number of notches 13 in thewheel 12 correspond tothe number. of teeth 'in-the cutter such as 8 to beground.v Accordingly, when cutters having a dierent number Otteeth are to be ground, it is, in accordance with this invention, necessary `to employ a fdifferentpost having a notched wheel 12 provided with a number of notches corresponding to the number of teeth of the cutter to be ground. k When the cutter such as 8 has been Aplaced into position upon the post 55, it will be apparent, therefore, that rotation of the shaft 65 Within the barre163 will rotate both the cutter and the notched wheel 12. Mounted upon the arm 10 extending lfrom the sleeve 61, is a pawl 14 adapted to cooperatewith the notches 13 of the notched wheeler ratchet 12. The pawl 14 is pivotally mounted upon a suitable vpin or screw such as 15 and is preferably provided with a sti coil spring 15 adapted to bias theA pawl in a clockwise direction as seenA in Figure 4. It is preferable that the spring 1`6`be of sufficient stiffness that in case the notched wheel 12 be stopped so that the end of the pawl 14Vis adjacent an inclined portion of the notch 13, the spring will be effective, by virtue of the cooperation of the inclined plane surface of,A the pawl 14 and a notch 13 to further rotate the notched wheel 12 with the Vpost 65 until the parts reach the position illustrated in Figure 4, in which thepawl is seated in the bottom of thenotch 13. Extending from the barrel 63, an armY 11 is preferably provided, having an adjustable screw 18 adapted to-engage the arm 58 and limit the movement of the support around the shaft 59 as an axis.

In the operation of the grinding apparatus just described, it is first necessaryv to select a post 65 having a notched wheel 12 with a number of notches equal to the number of teeth in the cutter to be ground. .With the post thus selected, the corresponding cutting tool may be mounted thereupon and secured in position by means of a knob 1 i. After the post 65 has been inserted into the barrel 63 and the setrscrew 66 suiciently tightened to retain the same inposition the set screw 51 may be loosenedand the shank 56 adjusted therein until the; leading edge of a tooth of the cutter such as 8; is, aligned with the rear or grinding face of the grinder 52, whereupon the set screw 51 may be again tightened.A It will be apparent, therefore, that inthe grinding of cutters in which the teeth extend at different angles,

the support of this invention may be adapted to receive the various cutters and accurately align the same with reference tothe grinder 52, merely by adjusting the shank 55 with relation to the frame. With this rst adjustment thus accomplished the support may be rotated about the shaft 59 as an axis until the edge of the grinder 52 is positioned Within one of the notches 53, it being understood that the wing nut 65 was preferably loosened pricr to this operation so that the split sleeve 61 and the pawl 14 move with the post 65 upon rotation thereof. After the proper angular position of the cutter with reference to the grinder 52 has been thus determined, the wing nut 68 may be tightened `in order toprevent relative 'rotation between the sleeve 51 and the barrel 63. With this adjustment made, it will be apparent that if vthe post 65 be rotated, it cannot be stopped in such a position that the leading Vedge of one of the teeth 54 will not be aligned with Ynotched wheel12 and the associated parts,v including post 65 and the cutter disposed thereupon in such position that the leading edge of a tooth thereof` is always aligned with the grinding face of the grinder 52. After these adjustments have been made, the machine may then be set into operation so that the grinder 52 is rotated and the operator may then swing the cutter support about the shaft 59 zasan axis so that the cutter mounted thereupon is moved in the direction indicated by the arrow in Figure 3, until the edge ofthe grinder 52 is within one of the notches 53. After the leading edge of one tooth has been ground, the operator may swing the support about the shaft 59 in the opposite direction whereupon the post 65 may berevolved, for instance a distance corresponding to. one notch of the wheel 12, so that the leading edge of the next adjacent tooth is now aligned with the grinding surface of the grinder 52. This series of operations may then be repeated until each of the teeth of the cutter have been properly ground. With an arrangement of this sort, it is apparent that when itis desired to sharpen such a cutter as that hereinbefore referred to, the grinding operation is accurately accomplished, each tooth being ground at thesame'angle and to the same extent in view of the fact that the screw 18 will in all events limit the travel of the support toward the grinder. With the use of such a support in the grinding of a cutter, itis apparent that the usual inaccuracy incident to manual operation is avoided and that any cuttermay be accurately ground regardless of the skill of the workman. It may be pointed out that such a support for grinding a cutter of this character is not limited Vto its use to a machine of the type which has been hereinbefore referred to, but is susceptible of general use in the various arts in which such cutters are employed.

From the foregoing description, it is apparent that many modifications of the machine hereinbefore described, and illustrated in the accompanying drawings, will present lthemselves to those skilled in the art which Will not depart from the spirit of this invention. It is to be distinctly understood, therefore, that the. invention is not limited to the specific details` set forth in the foregoing description and illustrated in the accompanying drawings, but that such modifications thereof and the use of such individualfea- Cil tures and sub-combinations of features, in the same, as well as in other relations than that of the illustrated embodiment, are, although not specifically described herein, contemplated by and within the scope of the appended claims.

Having thus described the invention, what is claimed is:

1. A device of the kind described comprising, a shaft, a tool detachably mounted on said shaft, a shield having portions extending in protecting relation to the cutting edges of said tool, adjustable means gripping said shaft to position the shield, said adjustable means having a manipulable portion protruding on the exterior of said shield, and a continuous circumferential protecting member overlying said manipulable portion.

2. A device of the kind described comprising, a shaft, a tool detachably mounted on said shaft, a stationary sleeve surrounding said shaft and extending into a position substantially close to said tool, a second sleeve carried by said rst sleeve in adjustable and floating relation thereto,

said second sleeve having portions extending in protecting relation to said tool, and means for holding said second sleeve against axial displacement.

3. A device of the kind described, comprising, a hollow shaft, a cutter having a bore fitting on the end of said shaft, a clamping element fitting in the bore of said shaft and having a part engaging said cutter, a guard for said cutter loosely mounted on said clamping element, and a member extending through said shaft and having manipulating means at the other end thereof adapted to operate said clamping element to secure said cutter.

4. A device of the kind described, comprising, a hollow shaft, a cutter having a bore fitting on the end of said shaft, a sleeve fitting the bore of said shaft and having a flange adapted to bear against said cutter, and a clamping screw within said shaft engaging said sleeve and having a manip- 20 ulating element at the other end of said shaft.

STEVENSON A. DOBYNE. 

